Abstract
Macroscopic aneurysms of the cerebral vessels are of interest to many workers in different fields of medicine. The internist, the neurologist, the ophthalmologist, the nerve surgeon, as well as the pathologist, have found the subject absorbing, and one which is not infrequently encountered. The recognition of the condition during life has been regarded as difficult until recently. After making an exhaustive analysis of 555 cases, Beadles1stated: "The conclusion that I have been forced to draw from a careful study of a large number of cases is that it is quite impossible to diagnose an aneurysm of any one of the cerebral arteries except in the most unusual circumstances—I will go further and say that, in the vast majority of cases of aneurysm a tumor even cannot be diagnosed." This dictum, however, no longer holds true. Studies by Fearnside,2Symmonds,3Parker,4Riddoch and Goulden,5Hassin

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